Question

water from a lake is a pure substance. true or false?

Answer 1

$\huge{\underline{\mathtt{\blue{A}\red{N}\pink{S}\green{W}\purple{E}\orange{R}}}}$ True

Explaintion

Water, H2O, is a pure substance, a compound made of hydrogen and oxygen. Most of the time, pure water has to be created. Pure water is called distilled water or deionized water. In distilled water all of the dissolved substances mixed in water have been removed by evaporation.

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Answer 2

The statement is true in the context of the molecular nature of water since water is always a pure substance independent of the source.

• Water is a universal solvent and it is a pure compound made up of two hydrogens bonded to an oxygen atom and thus it only contains one type of molecule that has all the chemical and physical properties of that substance.
• Lakes can be Oligotrophic or Eutrophic and depending upon these sources, the physical nature of the water can become more homogenous or heterogenous, a parameter used to denote mixtures but the molecular nature of the water remains constant.
• The purest form of the water is called distilled water devoid of any contaminants while contaminated water is a type of mixture.
• Oligotrophic lakes are clear with low nutrients and the least productivity whereas Eutrophic lakes are having more concentration of nutrient-enriched water with high productivity and algal bloom caused by cyanobacteria is very common in such lakes, depleting the oxygen concentration of water ultimately a threat and fatal condition to aquatic life.